Over the next 10 days Sanya tops out around 87° (Monday) and dips to 77° on the coolest night (Wednesday). Roughly 3.3 in of rain falls over the period, with Thursday the most likely wet day (92%). Wind is the one to watch: gusts to 28 mph around Saturday. Longer view: a tropical climate — warm all year, with the calendar split into wet and dry rather than hot and cold.
Sanya, China · 18.25°N, 109.51°E · Asia/Shanghai · Forecast computed for these exact coordinates